Mathematical formulation of periodogram built-in function

Question

Vaishakh Krishnan 2020-3-19

0
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https://ww2.mathworks.cn/matlabcentral/answers/511766-mathematical-formulation-of-periodogram-built-in-function

回答： Sai Veeramachaneni 2020-3-23

I used periodogram(data, hamming, [], freq) to generate autospectrum of a data. Where do I find the mathematical model of the above function - I would like to know the mathematical expressions used in the above calculations to write my research work.

The sample of my code is here where turbw is the data.

[pww, fww] = periodogram(turbw, hamming(length(turbw)), [],freq);

pww = smooth(pww);

sm1 = floor(length(fww)/20);

pww(1:sm1) = smooth(pww(1:sm1));

pww(sm1:end) = smooth(pww(sm1:end));